I am looking for real uniformity of application, while minimizing weight and supplies needed to build the apparatus. I would like to be able to isolate 2x4 foot areas of the bench by either changing nozzles or turning valves. I have built a prototype using inverted micro-sprinklers and uniformity is lacking. I am thinking of using Tee-jet, spray rig downward pointing nozzles (more what I imagine is used on manufactured dynamic booms in greenhouses) but I'm unsure of the best spacing, droplet size, coverage, overlap, etc. Any suggestions are welcome.